Telegraph.co.uk | Alzheimer's could be spotted 20 years before the first symptoms appear Telegraph.co.uk There are currently 850,000 people living with dementia in Britain, most of whom have Alzheimer's disease. That number is due to rise to one million by 2020 and two million by 2050. Sir Terry Pratchett, author of the Discworld novels, died at the age ... Latent Alzheimer's detectable decades before it strikes Alzheimer's can be spotted in people in their 30s, claim scientists Alzheimer's-related brain changes occur 2 decades before symptom onset |